JPH0561008B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deep drawing forming method, and more specifically, the present invention relates to a deep drawing forming method, and more specifically to a deep drawing forming method, in which a one-stroke or one-stamp material is subjected to a series of processes from blank punching to multi-stage drawing forming, edge cutting, and shaping. The present invention relates to a deep drawing method for completing a working process to obtain a deep drawing product.

[Conventional technology]

Conventionally, in the press manufacturing of deep-bottomed containers such as air cleaners, oil bottles, cans, etc., due to limitations such as material thickness, elongation rate, press workability, drawing rate, etc. The molding process must be divided into drawing steps. One example of carrying out this deep drawing process is a multi-machine division of labor in which each work process, such as punching a material blank, primary, secondary, tertiary...multi-drawing, shaping, etc., is divided into multiple press machines. However, this requires a large number of press machines, the same number of workers, and a large installation area and work space, which increases equipment and labor costs, and There are large cumulative errors due to machine precision, manufacturing of molds used for each machine, installation precision, errors, etc., and furthermore, the workpiece is transferred from the press of the previous process to the press of the next process. Each time it is processed, there are problems with heat generation due to multiple processing and work hardening and quality deterioration caused by natural cooling in the atmosphere after extrusion from the mold.

In order to solve this problem, a method was proposed and adopted that uses a single double-acting press and progressive molds or coaxially arranged composite molds to complete multiple press drawing operations in one stamp. has been done.

[Problem that the invention seeks to solve]

However, such drawing methods using conventional presses are limited by the structure and operation of the conventional machine itself, and are usually only capable of blank punching, primary drawing, and secondary drawing, or only primary or tertiary drawing of a pre-punched blank. It was not possible to perform deep drawing work, which involves multiple forming processes including edge cutting and shaping. Therefore, after the drawing process, it was necessary to perform edge cutting and shaping using a separate press. In addition, when using a progressive mold, the mold is bulky and a press with large capacity must be used, which consumes a lot of energy. It is extremely difficult to feed the material progressively in the same direction, and therefore it is suitable for stamping a core plate with no unevenness or a stamping of an eyelet without significant unevenness, but is not suitable for deep drawing. With coaxial composite drawing dies, it is possible to reduce the total number of processes by combining several processes into one process, the dies are not very bulky, and the work efficiency is very high, but as is well known, conventional The compound drawing die is equipped with a set of springs that support each lower punch or die and actuate the punches or dies upward after they have been subjected to the downward impact pressure of the ram and are acted upon by an upward elastic force. Therefore, the operating power of the press must be sufficient to overcome the load that can plastically deform the material as well as the resistance of the elastic force of the spring set, which necessitates the use of a large press. In addition, the mold had to be heavy enough to withstand the pressure of the press, which caused the problem of increased equipment and mold costs.

In addition, in the drawing method using the conventional double-acting press,
The stroke of the ram was limited to the stroke and structure of the wrinkle suppressor driven by a cam, and it was not possible to perform very deep drawing. For example, the stroke of a conventional double-acting press using a compound type is 200 mm.
In this case, the resulting product will only have a drawing depth of approximately 40% of the total stroke length (approximately 80 mm), and the remaining 60% of the stroke will be wasted. Therefore, it is extremely difficult to obtain a deep-drawn product with a depth of more than half the ram stroke by continuous one-stamp drawing using a conventional double-acting press.

[Means for solving problems]

Therefore, the present invention provides a pair of upper and lower crank cam devices 4 that are driven in relation to each other at different rotational speeds.
In the deep drawing method using a double-acting press equipped with A plurality of coaxially arranged punches 97a to 97d, 98, which are driven by the lower crank cam device 5 and move up and down in stages via a slide plate and a rod, are slidably housed inside the cylindrical outer mold 96. A step of attaching the lower die 9B formed by the above to the fixed bed 8 so as to face and correspond to the upper die 9A, and blank punching of the material placed on the upper surface of the lower die 9B by lowering the upper die 9A by the ram 6. At the same time, there is a step of bringing the lower mold 9B into close contact with the mold and pressing the punch 97a of the lower mold 9B.
~ 97d, 98 are raised stepwise relative to the dies 91 to 94 of the upper mold 9A for multiple drawing forming steps, and the final finishing punch 98 in the center of the lower mold 9B reaches or reaches the top dead center. Upper mold 9 on the verge
The edge cutting die 95 provided in the cavity of the uppermost die 94 of A is used to cut the edge of the drawn product, and at the same time, the finishing punch 98 is used to perform the final drawing and shaping (finishing) of the molded product. At the same time, the upper mold 9A and the lower mold 9B are raised and lowered so that they are separated from each other from the state in which they are closely joined, and at the same time, the final deep-drawn molded product is transferred to the cavity of the upper mold 9A. The product is extruded from the inside to obtain a deep-drawn molded product, and finally the upper mold 9A and lower mold 9B return to their initial separated state and 1
To provide a deep drawing forming method comprising a step of terminating a stroke.

[Effect]

According to the present invention, a pair of upper and lower crank cam devices 4 and 5 are driven in relation to each other at different rotational speeds.
A deep drawing press comprising: a ram 6 that moves up and down driven by the crank cam devices 4 and 5; and a slider set 7 that moves up and down stepwise at a time difference during the one-stroke cycle of the ram 6. an upper mold 9 having a plurality of dies 91 to 95;
A coaxial composite mold 9 consisting of a lower mold 9B having a plurality of punches 97a to 97d, 98 is installed, and the strip material fed into this mold is blank-punched with one stroke (one stamp). Multiple drawing forming, edge cutting, shaping,
Through a series of processes such as extrusion of finished products and residual materials, drawn products can be obtained, and products such as containers with deep bottoms where the depth of drawing is almost the same as the total length of the stroke can be obtained easily and efficiently. The power required for the press operation is lower than that of conventional press machines, using a compound type or progressive type, and furthermore, the process from material to finished product is done with one stamp using the same press and the same die. Since the product is completed, there is no loss of time and space such as transporting semi-finished products or waiting for the process.
During processing, there is no cooling of the temperature of the semi-finished product due to repeated contact with the cold air in the room, and the finished product is completed under the same processing conditions as on a coaxial machine, resulting in high precision and extremely good quality. Draw-formed products can be efficiently formed.

〔Example〕

The present invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 and 2, the press for carrying out the deep drawing method of the present invention mainly has a side surface approximately C.
A straight-walled frame 1 having a letter-shaped shape, a drive unit 2 attached to the upper end of the frame 1, a transmission mechanism 3 attached to an arbitrary side wall of the frame 1, and an upper crank attached to the front upper part of the frame 1. - A cam device 4, a lower crank cam device 5 provided at the front lower part of the frame 1, and a lower crank cam device 5 that can be interlocked with a ram 6 provided at the bottom of the upper crank cam device 4. a slider set 7 provided on the upper part of the slider set 7 and arranged in a multi-stage manner;
It consists of a fixed bed 8 provided above the slider set 7.

The frame 1 forms a work space approximately in the center of the front, and is a structure made of steel plate or other material with a gate-shaped front and a C-shaped side. , this driving machine 2 uses a continuously variable speed motor in this embodiment,
The present invention is not limited to this type of motor, and other types of drive machines can also be used. Further, the driving machine 2 is located outside the upper surface of the frame 1, and is located on the frame 1 suitable for driving.
It is well known to those skilled in the art that it may be installed at any location within the frame 1 or at a location remote from the frame 1.

The transmission mechanism 3 is provided on the side wall of the frame 1 and is a device that transmits the rotational force of the drive machine 2 to the upper and lower crank cam devices 4 and 5, and is a device that transmits the rotational force of the drive machine 2 to the upper and lower crank cam devices 4 and 5.
1, an upper driven pulley 33 which also serves as an upper flywheel and which is transmitted to the pulley 31 via a belt 32, a lower driven pulley 35 which also serves as a lower flywheel and which is driven by the driven pulley 33 via a belt 34; An upper brake clutch 36a provided between the upper pulley 33 and its transmission shaft 30a, a lower brake clutch 36b provided between the lower pulley 35 and its transmission shaft 30b, and an upper reduction gear device 37 driven by the upper pulley 33. , and a lower reduction gear device 38 driven by a lower pulley 35.

The upper reduction gear device 37 includes a main drive gear 37a attached to a transmission shaft 30a, and a driven gear 37 attached to an intermediate shaft 39a whose both ends are supported by both side walls of the frame 1 and meshes with the main drive gear 37a for transmission.
b, and the gear 37 attached to this intermediate shaft 39a.
c and the crankshaft 4 of the upper crank cam device 4
The lower reduction gear device 5 consists of a final gear 37d attached to one end of the gear 37c and transmitted by meshing with the gear 37c.
8a, a gear 38b attached to an intermediate shaft 39b whose both ends are supported by both side walls of the frame 1 and meshing with the gear 38a for transmission; a gear 38c attached to the same intermediate shaft 39b; A gear 38d is attached to another intermediate shaft 39c supported by both side walls and meshes with the gear 38c to transmit power;
It consists of a gear 38e attached to the intermediate shaft 39c, and a final gear 38f provided at one end of the crankshaft 51 of the lower crank/cam device 5 and meshing with the gear 38e for transmission.

In this configuration, when the drive machine 2 rotates clockwise as shown in FIG. 2, the upper crank cam device 4 is driven to reduce speed by the upper reduction gear device 37 of the transmission mechanism 3 and rotates in the same direction as the drive machine 2. At the same time, the lower crank cam 5 is connected to the lower reduction gear device 3.
8 and rotates in the opposite direction to the drive machine 2.

In this embodiment, the upper reduction gear device 37 is placed on the upper left side of the frame 1 shown in FIG. 1, and the lower reduction gear device 38 is placed on the lower right side of the frame 1. The positions on the same side of the frame 1 or on both left and right sides may be exchanged. Further, the speed ratio between the upper crank cam device 4 and the lower crank cam device 5 is selected to be higher than the latter depending on the design, but normally the speed ratio between the two is, for example, 2:1 to 2:1. It is preferable to select the ratio within the range of 10:1. Also, both devices 4,
5 may be rotated in the same direction. Furthermore, the transmission mechanism 3 can also adopt a chain sprocket device or other suitable transmission device, instead of a belt pulley.

The upper crank cam device 4 is shown in FIGS. 2 and 3.
As shown in the figure, it is driven by an upper reduction gear device 37, and one end is connected to the final gear 3.
7d, a block-shaped connector 43 which is rotatably attached to the crank pin 42 of the crankshaft 41 and extends downward perpendicular to the crankshaft 41, and this connector 43 whose length is adjustable. A bolt 44 screwed onto the tip of the
It is composed of a pair of heart-shaped cams 45, 45 that are symmetrically attached to the crankshaft 41 at intervals on both sides of the crank portion that supports the crank pin 42.

The lower crank cam device 5 is provided below the upper crank cam device 4 so as to face it, and is driven by the lower reduction gear device 38, and is shown in FIGS. 1 and 4. As shown, a crankshaft 51 with a final gear 38f attached to one end, a block-shaped connector 53 rotatably attached to a crank pin 52 of the crankshaft 51 and extending upward perpendicular to the axis, and this connector. Connecting rod 54a attached to the tip of 53
and this rod 5 via the ball joint 50.
a central lifting rod 54b connected to the tip of 4a;
A plurality of pairs of cams 55 are attached to the crankshaft 51 in a step-like manner so that the left and right pairs are symmetrical about the crank pin 52 and support the crank pin 52;
Consists of 55, 56, 56, 57, and 57.
In this embodiment, this cam set includes small-sized cams 55, 55 provided at both ends of the crankshaft 51, and a crankshaft 55, which is in contact with the inside of the small cams 55, 55.
It consists of three pairs of cams: medium-sized cams 56, 56 provided in 1, and large-sized cams 57, 57 provided with both sides touching the inside of the cams 56, 56 and the outside of the connector 53. However, the number of cam sets can be adjusted depending on the number of deep drawing processes, the composite mold, the workability and thickness of the material, etc.
Incidentally, inside the top ends of the longest diameter portions of the large cams 57, 57 are further provided projections 58, 58 which perform a fourth cam function, and the function thereof will be described later.

As shown in FIG. 1, the ram 6 is installed below the upper crank cam device 4 in a vertically slidable manner with its both sides guided by a pair of guide portions 11 provided at the top of the frame 1, and its upper end is guided by a pair of guide portions 11 provided at the top of the frame 1. The joint member 61 provided at the location and the ball 4 at the lower end of the connecting bolt 44
4a, and is integrally connected to the connector 43 by a ball joint. Springs 62 are provided on both sides of the ball joint in the recess so as to constantly bias the sliding plate 64 at its lower end downward. Pressing plate 9 via connecting rod 65 that penetrates
4a is connected to a sliding plate 64. In addition, Ram 6
A pair of left and right ram presser bars 63 are screwed onto the upper surface of the bolt 44, and a roller 63 that intermittently cooperates with the cam 45 is attached to the upper end of the presser bar 63.
A is provided.

The slider set 7 is provided above the lower crank/cam device 5 at the front lower part of the frame 1.
A top plate 7 whose both ends are fixed to both inner walls of the frame 1
1, and a lower plate 7 fixed to both inner walls of the frame 1 at a predetermined interval below the upper plate 71.
2, both side plates 73, 73 fixed upright in parallel to each other on both sides of the upper and lower plates 71, 72, and a plurality of stages (four stages in this embodiment) with appropriate intervals between the upper and lower plates 71, 72. ), and both ends are located on both side plates 7
Slide plates 74a to 74d are provided to be vertically slidable along the inner surfaces of the parts 3 and 73, and the upper ends of the slide plates 74a to 74d are in contact with the lower surfaces of the slide plates 74a to 74d, respectively, and the lower ends of the lower crank and cam devices 5 are respectively attached to the slide plates 74a to 74d. A plurality of pairs (four pairs in this embodiment) of lifting rods 76a to 76a are provided with rollers 75 that cooperate with pairs of cams 55 to 57.
76d. Note that the lower end of the rod 76d is in contact with the surface on the rotation locus of the cam protrusion 58 inside the cam surface of the cam 57, and when the cam 57 rotates,
The lower end of the rod 76d rides on the protrusion 58.

The fixed bed 8 is provided on the upper surface of the upper plate 71 so as to face the upper ram 6, that is, the movable bed. As shown, they are mounted on the ram 6 and the bed 8, respectively.

The upper end of the central lifting rod 54b is the upper and lower plate 7.
1, 72, each of the slide plates 74a to 74d and the bed 8 are slidably penetrated, and then protruded above the bed 8, and the elevating rod 76a is also slidably moved between the lower surface plate 72 and the slide plate 74b. ~74d
The rod 76b also passes through the lower surface plate 72 and the slide plates 74c to 74d, and its upper end touches the lower surface of the first stage slide plate 74a. The rod 76c penetrates the lower plate 72 and its upper end abuts the lower surface of the fourth slide plate 74d, and the rod 76d passes through the lower plate 72 and the slide plate 74d and its upper end is the third stage slide plate 74
It is in contact with c. (See FIG. 1) One embodiment of the mold 9 used in this press is composed of an upper mold 9A and a lower mold 9B, as shown in FIGS. 5A and 5B. The upper mold 9A has a plurality of dies coaxially arranged in stages such that the cavity diameter becomes gradually smaller and the depth becomes deeper from the bottom to the top depending on the number of forming steps required for the deep-drawn product. 9
Includes 1, 92, 93, 94, and the top die 9
At the periphery of the opening on the die 93 side of the cavity No. 4,
Further, the pressing plate 9 provided above the die 94
One end is connected to the lower surface of 4a, and the other end is connected to the die 94.
An annular edge-cutting die 95 that can be moved up and down by being pressed against the lower surface of the pressing rod 94b that penetrates the cavity is provided, and a pressing plate 94 is located inside the upper opening of the cavity.
An extrusion plate 94c is attached to the lower surface of the center of the cavity with a space therebetween, and is slidable relative to the cavity. Further, the lower mold 9B includes a cylindrical outer mold 96,
An annular punching die 96a that is fitted onto the outer peripheral surface of the upper end of the outer mold 96, whose upper end slightly protrudes above the outer mold 96, and whose upper inner peripheral edge serves as a blank punching cutting edge, and each of the upper mold 9A. A plurality of punches 97a to 97d are coaxially arranged in multiple layers so as to correspond to the inner diameters of the dies 91 to 94, respectively, and a central rod 54.
and a finishing punch 98 attached to the upper end of b.
A plurality of push-up rods 99a-99 each have one end extending downward at the lower end of each punch 97a-97d.
The upper ends of d are connected, and these push-up rods 9
The lower ends of 9a to 99d are respectively slide plates 74a.
It is in contact with the top surface of ~74d, but rod 99c
and 99d are the slide plates 74c and 74d that should come into contact.
are arranged so as to exchange positions with. That is, the lower end of the rod 99c is connected to the slide plate 74d,
The lower end of the rod 99d is in contact with the slide plate 74c.

Next, the operating state of the press of the present invention configured as described above during use will be explained.

First, when the drive machine 2 rotates, the upper and lower pulleys 33 and 35 are connected to the drive pulley 31 and the belts 32 and 34.
The rotational motion is synchronous and in the same direction due to the power transmission (see Figure 2). The upper crank cam device 4 is connected to the pulley 3 by the reduction transmission of the upper reduction gear device 37.
The lower crank cam device 5 rotates in the same direction and at a low speed as the pulley 35 due to the reduction transmission of the lower reduction gear device 38. Since the rotational speed ratio of the upper crank cam device 4 and the lower crank cam device 5 is set to 4:1 in this embodiment, the upper crank cam device 4 rotates one revolution.
When rotated through 360°, the lower crank cam device 5 can rotate only 1/4 turn, or 90°. In reality, it goes without saying that this speed ratio can be selected to any suitable value depending on the workpiece and processing conditions. The operational relationship between the above two devices will be described in detail later.

Next, the deep drawing method using a press according to the present invention will be explained based on FIGS. 5 to 7. In other words, when the upper crank cam device 4 rotates 180 degrees from the top dead center a and reaches the bottom dead center b, the upper die 9A attached below the ram 6 is connected to the ram 6 by the connector 43 and the bolt 44. Together, they descend along the guide section 11,
The material W placed on the upper surface of the lower mold 9B is punched out and the fifth
The situation will be as shown in Figure A. When the ram 6 descends to the bottom dead center b, the long diameter ends of the pair of cams 45 of the crankshaft 41 just press downward the roller 63a at the upper end of the presser bar 63 of the ram 6, and press the ram 6. The pneumatic brake clutch 36a of the pulley 33 disconnects the coupling action of the clutch by blocking the air passage of the solenoid valve switch (not shown), and the crank cam device 4 stops rotating in this position; The ram 6 is surely held at the bottom dead center position b where it is pressed against the lower die 9B.

At the same time that the upper crank cam device 4 rotates from the top dead center a to the bottom dead center b as described above, the lower crank cam device 5 rotates from the bottom dead center position c to the top dead center d as shown in FIG. It used to rotate,
In this embodiment, the speed ratio of the upper and lower crank cam devices 4 and 5 is set to 4:1, so the upper crank cam device 4 rotates 180° and the bottom dead center b
When the lower crank cam device 5 reaches the bottom dead center c
It will rotate by 45 degrees in the direction shown by the arrow. After that, the upper crank cam device 4
The rotation of the lower crank cam device 5 is stopped by the separating action of the clutch 36a, but the lower crank cam device 5
However, it continues to rotate because it still maintains its connected state. At this time, the cam surface of the first cam 55 passes through the rod 76 to the first stage slide plate 74.
Push up a. Then, the slide plate 74a pushes the first punch 97a upwardly through the push-up rod 99a into the cavity of the die 91, and performs the first drawing forming on the previously punched blank W. Let the stroke of 97a be _S1 . As the lower crank cam device 5 continues to rotate, the cam surface of the second cam 56 is moved to the lifting rod 7 after the first forming of the first punch 97a.
6b, the second punch 97b is pushed into the cavity of the die 92 via the second stage slide plate 74b and the push-up rod 99b, and the material W that has undergone the first drawing is subjected to second drawing forming. The stroke of the punch 97b at this time is _S2 . Subsequently, the cam surfaces of the third cams 57, 57 simultaneously push both the fourth punch 97d and the third punch 97c overlapping the die 93 through the rod 76c, the fourth slide plate 74d, and the push-up rod 99d. The material W is pushed into the cavity and undergoes secondary forming.
Punch 9 at this time performs tertiary drawing forming.
Let the stroke of 7c be S ₃ . At this time, the crank pin 52 of the lower crankshaft 51 comes to an upper position close to the top dead center d, and the finishing punch 98 in the center is inserted into the uppermost die 94 by the connector 53 via the rods 54a and 54b. After being pushed in, the material W is subjected to fourth-grade drawing forming and finishing shaping.
The crank 5 rises to top dead center d and completes one stroke S, but at this stage of operation,
The protrusion 58 that is higher than the cam surface of the cam 57 is at the top dead center d
Push up the rod 76d in front of the edge-cutting die 95 inside the die 94 against the spring 62 to push the third punch 97c up through the third slide plate 74c and the rod 99d.
At the same time, the finishing punch 98 cuts the edges of the material W that has been drawn and formed using the cut edges of the die 95 and the die 94. Push it inside, perform final finishing shaping, and finish drawing forming. (See Figure 5B). At this time, the lower crank cam device 5 reaches the top dead center d, and from there it makes the remaining half rotation toward the bottom dead center c.

When the lower crank cam device 5 has risen to top dead center d, the upper crank cam device 4 is reconnected by the action of a solenoid valve (not shown) that is interlocked with the lower crank cam device 5. The ram 6 is rotated from the bottom dead center b toward the top dead center a by the clutch 36a, and the ram 6 rises together with the upper mold 9A via the connector 43 and the bolt 44, and returns to the original upper state at the same time as the solenoid valve is activated. Stops due to release action and braking action. On the other hand, since the lower crank cam device 5 continues to rotate from the top dead center d toward the bottom dead center c, each of the slide plates 74a to 74d
is lowered as the lifting rods 76a to 76d are lowered in the opposite manner to the above, and each punch 97a to 97d is also lowered step by step via the rods 99a to 99d, and at the same time, the finishing punch 98 is also connected to the connector 53 and the pushing rod. As the punches 54a and 54b descend, the punches 97a to 97d and 98 eventually return to the state housed inside the lower mold 9B, and
The deep-drawn molded product W in the uppermost die 94 is pushed downward by the extrusion plate 94c via the sliding plate 64, the connecting rod 65, and the pressing plate 94a by the return force of the spring 62, and the molded product is Complete the extrusion process,
At the same time as returning to the state shown in Figure 5A, the upper and lower cranks
The cam devices 4 and 5 also return to the top dead center a and bottom dead center c positions, respectively, as shown in FIG. 6, completing one cycle of the one-stroke stamp. Thereafter, by repeating the same cycle, the material sent to the mold can be continuously formed into one drawn product with each stroke.

An example of the relationship between the rotational state, stroke, and machining process in one cycle of the upper and lower crank cam devices is shown in the chart of FIG.

In the above embodiment, an example was described in which multiple steps from blank punching to primary to quaternary drawing forming, edge cutting, shaping (finishing), and finished product extrusion are completed in one cycle and one stroke. The method is not limited to this only application. In practice, the present invention can be used in various drawing forming operations by increasing or decreasing the number of crank cam devices 4, 5 or the number of cams, or by simply selecting and using the necessary cams without changing them. I can do it. For example, in the case of tertiary drawing molding, the outermost rod 76a may be removed to prevent the rotation of the first cam 55 from being transmitted to the first slide plate 74a. If secondary drawing molding is used, remove the rods 76a and 76b and remove the first cam 5.
5 and the second cam 56 are the first and second slide plates 74
It is sufficient to prevent the movement from being transmitted to a and 74b.
Of course, in this case as well, the mold 9 must be a coaxially arranged composite die set capable of producing a predetermined molded product. Further, in this embodiment, the cams 55 to
57 is formed in a bilaterally symmetrical shape as shown in FIG. 6, but in reality, it can be formed into an asymmetrical shape depending on the time of each molding process and the timing of previous and subsequent operations.

In the above embodiment, the edges are cut before the finishing punch 98 reaches the top dead center, and the final finish is applied to obtain a drawn product without edges. However, if the protrusion 58 is If the punch 98 is provided at the bottom dead center C position shown in FIG. 2 and the edge is cut when the punch 98 completes the final finishing, an edge-cut drawing molded product can be obtained.

Also, the mounting devices of the upper and lower crank cam devices 4 and 5 are reversed, and the upper mold 9A and lower mold 9B are mounted in the lower and upper positions correspondingly, that is, the punch is placed upward and the die is placed in the upper position. It is clear that it can also be configured to be located below.

Another feature of the present invention is that if this press is used to perform general punching work such as motor core plates or drawing work of simple molded products due to operational necessity, simply check the connection state of the lower clutch 36b. is released to maintain the lower crank cam device 5 in a stopped state, and at the same time, the upper clutch 36a is always maintained in an engaged state to continuously rotate only the upper crank cam device 4, thereby moving the ram 6 up and down. For example, it can be used for general press work in the same way as conventional double-action presses, and the scope of use of the present invention can be expanded.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to perform a series of deep drawing processes from blanking to multiple drawing forming, edge cutting, and finishing shaping in one stroke or one stamp, which was extremely impossible with conventional presses. The process can be carried out easily and reliably, and is completed in one continuous operation within a short period of time in the same mold, from when the blank is fed into the machine until the finished product is ejected from the mold. This eliminates the loss of time waiting for semi-finished products and the influence of atmospheric cooling on semi-finished products, and also suppresses the occurrence of work hardening due to long processing times. Since there is no cumulative error in machining accuracy that would otherwise occur, production efficiency can be improved several times compared to conventional presses, and the quality and precision of the molded products are very good, and the surfaces of the products are also extremely smooth. No wrinkles etc. Further, according to the present invention, the multi-step molding process can be completed with one stamp, but in the operation of the machine, each of these next steps is performed in stages at different times, so the required power is the same. Compared to the power required to produce deep-drawn products using a conventional press, this method requires less horsepower, which saves energy, and allows the use of lighter and lighter molds, reducing material costs. can. Furthermore, in the present invention, the stroke of the crank mechanism can be fully utilized, and in the case of the above embodiment, approximately 90% of the stroke can be utilized, resulting in a machining depth that is more than twice that of a conventional press. In addition, the volume of the machine can be reduced, and a single press can form deep-drawn products through multiple drawing processes that could not be achieved with conventional presses. Simply punching and simple bending,
It is an extremely useful invention that can be used for shallow drawing molding, etc.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view partially sectional, Fig. 2 is a side view, Fig. 3 is a perspective view showing the upper crank cam device, and Fig. 4 is a lower part. FIGS. 5A and 5B are perspective views showing a crank cam device, and sectional views showing an example of a mold used in the present invention, showing the states before and after the punch set is operated, respectively. FIG. 6 is an explanatory diagram showing the operating state of the upper and lower crank cam devices, and FIG. 7 is an operational analysis diagram showing the relationship between the stroke and time of the same device. 1...Frame, 2...Driver, 3...Transmission mechanism, 4...Upper crank/cam device, 5...Lower crank/cam device, 6...Ram, 7...Slider set, 8...Fixed Betsudo.

Claims (1)

[Scope of Claims] 1. In a deep drawing method using a double-acting press equipped with a pair of upper and lower crank cam devices 4 and 5 that are driven in relation to each other at different rotational speeds, Ram 6 moving up and down
An upper mold 9A is attached to the top mold 9A, which is made by stacking a plurality of dies 91 to 94 coaxially arranged in stages such that the diameter of the cavity becomes smaller and the depth becomes larger from the bottom to the top. Punches 97a to 97 are arranged coaxially to correspond to the cavities of the dies 91 to 94 of the plurality of upper molds 9A, which are driven by the lower crank cam device 5 via a rod and move up and down in stages.
d, 98 slidably housed inside the cylindrical outer mold 96, and attaching the lower mold 9B to the fixed bed 8 so as to face and correspond to the upper mold 9A;
A is lowered by the ram 6 to blank punch the material placed on the upper surface of the lower die 9B, and at the same time, the lower die 9B is brought into close contact with the lower die 9B to press the die.
The punches 97a to 97d, 98 are raised stepwise relative to the dies 91 to 94 of the upper mold 9A for multiple drawing forming steps, and the final finishing punch 98 in the center of the lower mold 9B reaches the top dead center. Alternatively, just before the product arrives, the edges of the drawn product are cut using the edge cutting die 95 provided in the cavity of the uppermost die 94 of the upper mold 9A, and at the same time, the finishing punch 98 is used to cut the edges of the drawn product. The process of final drawing and shaping (finishing), raising and lowering the upper die 9A and lower die 9B from a state in which they are closely joined to each other so as to separate them from each other, and at the same time, deep drawing after final shaping. Deep drawing consists of extruding the molded product from the cavity of the upper mold 9A to obtain a deep drawn molded product, and finally returning the upper mold 9A and lower mold 9B to their initial separated state to complete one stroke. Molding method. 2 Upper crank cam device 4 and lower crank cam device 4
The cam device 5 rotates in the same direction or in the opposite direction,
The deep drawing method according to claim 1, wherein the former rotates at a higher rotational speed than the latter. 3. The deep drawing method according to claim 1, wherein the rotation speed of the upper crank cam device 4 is 2 to 10 times faster than that of the lower crank cam device 5. 4 The ram 6 of the upper crank/cam device 4 descends to the bottom dead center, tightly joins the upper mold 9A to the lower mold 9B and presses the mold, then the ram 6 stops and the crank of the lower crank/cam device 5 The crank of the lower crank cam device 4 and the lower crank cam device 4 continue to hold the mold until they reach the top dead center, and when the crank of the lower crank cam device reaches the top dead center and then starts rotating toward the bottom dead center, the upper crank cam device 4 and the lower As the crank cam device 5 approaches the top dead center and bottom dead center, the upper die 9 rises and descends.
After the upper mold 9A is separated from the lower mold 9B and the ram 6 lifts the upper mold 9A to the top dead center, the ram 6 stops and maintains that state until the lower crank cam device 5 reaches the bottom dead center. A deep drawing method according to claim 1. 5 A spring is always applied downward so that the extrusion plate 94c for extruding the molded product provided inside the top die 94 of the upper die 9A and the edge cutting die 95 for cutting the edge of the molded product move up and down synchronously. 2. The deep drawing method according to claim 1, wherein the deep drawing method is provided below the ram 6 via the ram 6.